title: In situ measurement of UV fluence rate distribution by use of a micro fluorescent silica detector.
abstract: The fluence rate (FR) distribution in an ultraviolet (UV) reactor was determined experimentally in situ by use of a novel 360° micro fluorescent silica detector (MFSD). The UV response of the MFSD was systematically characterized, and the results indicated that this detector responded only to UV in the range from 210 to 280 nm. The nonlinearity was found to be less than 1% as the FR varied from 0.083 to 2110 μW/cm2. The luminescent signal increased by 0.11% for every degree increase in temperature in the studied range of 0-55 °C. FR distribution tests were performed in different media (air or water) with the water transmittance at either 95% or 85% determined in a 1-cm path length. The FR distribution of the near-lamp region (e.g., radius<50 mm) was well determined with the nearest distance to the sleeve being less than 3 mm. Comparisons were made between the experimental data and the calculations by use of the UVCalc model. This work demonstrates that the MFSD is a novel technique that can provide in situ and real-time measurements of the FR distribution in a UV reactor.
authors.affiliation: State Key Laboratory of Environmental Aquatic Chemistry, Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences, 18 Shuang-qing Road, Beijing 100085, China.
authors.forename: Mengkai
authors.initials: M
authors.lastname: Li
authors.forename: Zhimin
authors.initials: Z
authors.lastname: Qiang
authors.forename: Tinggang
authors.initials: T
authors.lastname: Li
authors.forename: James R
authors.initials: JR
authors.lastname: Bolton
authors.forename: Changlong
authors.initials: C
authors.lastname: Liu
mesh_terms: D004203:Disinfection / Q000379:methods; D005069:Evaluation Studies as Topic; D005453:Fluorescence; D057446:Hydrodynamics; D008163:Luminescent Measurements; D012822:Silicon Dioxide / Q000032:analysis / Q000737:chemistry*; D013052:Spectrometry, X-Ray Emission / Q000379:methods*; D014466:Ultraviolet Rays; D018508:Water Purification / Q000379:methods
chemical_list: D012822:Silicon Dioxide